Air pump



Jan. 9, 1923. 1,441,829..

0. 0. BRANDT.

AIR PUMP.

FILED APR.15. 1920. 2 SHEETS-SHEET l.

' llu;

A TTOB/VEVS C. D. BRANDT.

Jan. 9,1923.

AIR PUMP.

FILED APR. 15. I920.

2 SHEEIS-SHEET 2.

q 42 Minimum 4/ 7 h v l/Vl/E/VTOR UL ad. BY 0; M ff ml g ATTORNEYSWITNESSES comprising a continuation of the axial bore l atcnted .illan.Q, llhiilli.

llll l lrrltln starry;

ones. are n. nnannr, or new roan, n. r;

nrn rmirr.

Application filed April 15, 19230... Serial No. 374,097.

il o all 10/1/0712, may concern l lie it known. that I, CrrARLns ll).BRAND'J, a citizen of the United States, and resident of Richmond Hill,borough and county of (Queens, city and State of NewfYork, have inventedcertain new and useful llniprove ments in Air Pun'lps, of whichthefollowing is a specification.

llly invention relates to air pumps and more particularly to that typethereof which is manually operatedjand is. used primarily for inflatingpneumatic tires. The object of my invention is to provide a novelconstruction whereby the general serviceability and efficiency of thepump is increased and whereby its cost of production and maintenance isreduced to a minimum. My in vention will befully describedhereinafterand the features of novelty will be pointed out in the appended claims.

In the accompanying drawings, which show an example of my inventionwithout defining its limits, Fig. 1 is anelevation of a pump embodyingmy invention; Fig. 2 is a cross section thereof on the line 2--2 of Fig.1; Fig. 3 is a detail sectional view of the handle construction; Fig. lis adetail view of the piston rod; Fig. 5 is a section on the line 5-5of Fig. 3; Fig. 6 is a similar view on the line 6-43 of Fig. 5; Figs. 7and 8 are detail sections illustrating the cap tlastening; Fig. 9 isasectional "elevation of the plunger; Figs. 10 and 1.1 are sectionalviews on the lines.10- -1O and 11- 11 respectively of Fig. 9; Fi9x12 isa detail section of the locking Washer; and Figs. 13,14, 15,16 and 17are detail views illustrating the stirrup construction. 1 i

As shown in the illustrated example the pump comprises the customarycylinder or barrel 10 of any suitable length and di ameter and the base1]. to which one end of said cylinder is attached. The means whereby thecylinder and, base are connect ed rernresents one of the novel featuresof theinvention. By reference to Fig. 13 it will be seen that the oneend of the cylinder 11ft) projects into a tubular neck 12 of the base .1l and is formed with an enlargement 13 which within a complementalrecess 1. .1:

'15 of said neck 12. With-this arrangement (o-operating shoulders 16 and17 are prorid ul respectively in the neck 12 and on the evlindcr 11.0and by engagement which each.

1 other prevent a separation of the cylinderand base in an axialdirection. In order to positively lock said cylinder and base togetheragainst relative rotation or other relative movement, the baseis formedwith an internal annular flange 18 which flares out wardly and engagesthe cylinder 10 beneath. the shoulder 17 as shown in Fig.13.

The base 11 with its tubular neck 1 12, bore15, continuing recess 14:and internal annular flange 18which in its initial condition occupies anupright position as shown by dotted lines in 13, may be produced in anyconvenient manneras by casting, it being understood that the diameter ofthe here 1.5 is such as to snugly fit. about the cylinder 10 when thelatter is connected with the base 11. i

The cylinder 10in its original condition may be of. approximately evendiameter throughout andis combined with the base 11 by inserting its oneend into the bore 15 until it engages the end face thereof. In thisposition :the cylinder 10 projects between the recess 14: and the flange18; by means of suitable mechanism this end of the cylinder 10 isexpanded until the shoulder 17 is forced into firmsurface engagementwith the shoulder 16. After this has been done the flange 18 isexpanded, bymeans of a suitable tool, until its periphery is locatedbeneath the shorilderl'? and in firm, rigid engagement therewith, itbeing under: stood that the parts are proportioned and located so as tosecure thisresult.

lVith this arrangement, which is very simple and economical to produce,the cylinder 10 and base 11 are rigidly and securely fastened togetheragainst relative movement.

in all directions including rotation.

T he invention includes further a novel means whereby the stirrup may beconveniently connected with the base so as to be readily detachedtherefrom.

In the illustrated example which has been cho en. for (lGSUllPlIlVQpurposes, this means coiinprises a locking member 19 which is rotatablymounted upon the base 11 and extends therefrom as shown in Fig. 13 andwhich is formed with a preferably elongated head 20. The base 11 isfurther formed with lugs 21 located in spaced pairs at the corners oithe base if the latter is of rectangular form and being correspondinglyarranged it the base is of other configuration.

ber 22 as shown in Figs. 13 and 15 or it may The I. stirrup ntiaycomprise a rigid metallic memcomprise members 23 hinged together asshown in Figs. 16 and 17. In the latter case, which constitutes afolding stirrup, the hinge thereof is located within the confines of thebase 11 when connected therewith; the purpose of this will appear morefully hereinafter.

In any case the members 22 and 23 are provided with preferably elongatedslots 24: having a width'andlengthito permit the passage therethrough ofthe head when the latter is -in registry with said slots and to preventits withdrawal when said head is turned through'an arc of 45 sous'toextend transversely across said slots. The stirrup in the formsillustrated includes depending longitudinal flanges 25 which engage thelugs'2l and-prevent rotation 'ofthe stirrup relatively to the base aboutthe major axis of-thelpump; it will beunderstood thatthese flanges25xare not absolutely necessary and that the width of the stirrup isalways such that it fits nicely between the lugs 21.

To'connect the stirrup with the base, the head 20 of the locking member19 is passed through the slot 2% and then turned through anarc offorty-five degrees so as to extend transversely to the slot. The partsare so arranged and proportioned that the head 20, when turned asdescribed, will bear against the stirrup and thus by pressing it againstthe base rigidly secure it in position; the lugs 21 prevent-rotation ofthe stirrup about the axis of the'pump. To-detach thestirrup it issimply necessary to turn the head 20 untilit registers with the slot 2iwhereupon thelstirrup may be readily removed; With the arrangementdescribed the pump and stirrup may be easily disconnected tofacilitatecarrying in a tool receptacle and may be quickly'conneetedwhen the pump desired for use. If the hinged stirrup is used it isconnected and disconnected in the same way as described but preferablyoccupies a position at right-angles to that/of the solid stirrup whenconnected with said base. In this form the members 23 may be folded upwhen the stirrup is detached from the ba 11 if for any reason this isdesired. By having the hinge located within the confines of the base 11the latter forms a stop whereby pivotal movement on the hinge isprevented when the pump pistonis actuated, particularly in an upwarddirection.

At-the end opposite to that at which the base ll is located the cylinder10 is provided with the customary cap 26 having the usual axial openingfor the passage of the piston rod. In the present instance this capinstead of being screw-threaded upon the cylinder 10 as is usually thecase is connected there with in a novel manner. As shown in theillustrated example the cap 26 is formed with an annular flange 27 which[its over the cylinder 10 and is provided with one or more apertures:28, two located at diametrically opposite points being preferred.'lhcsc apertures are arranged to register with similar apertures 29formed at appro n'iatc points in the cylinder 10 and accommmlatefastening devices in the form of studs hav ing heads 30 and shanks 31split in a lengthwise direction amlprovided with notches 32: the memberscomprising the split shank 31 are resilient and normally tend to spreadapart as shown in Fig. 7. The studs arc inserted into the apertures 2%and .29 by pressing the shank members togidhcr; said members spreadingapart because of their inherent resiliency as soon as the notches 2E2register with the flange .27 and thus preventing said studs from beingunintentionally withdrawn from said apertures. It will be understoodthat the shanks 31 are of such length as not to project inwardly beyondthe inner surface of the cylinder ll) and that the notches 32 arelocated so as to snap over the peripheral surface of the apertures .28when the heads 30 are in engagement with the-outer surface of the flange27. \Vith this arrangement the cap 26 is positively loe-kcd uponthecylindcr 10 against unintentional removal in a simple and eflieientmanner; to remove the cap the members of the shanks 31 are broughttogether against their resiliency, for instance. by exerting an outwardpull upon the heads 30 suflicient to disconnect the notches 32 from theflange 2T.

Inaddition to the parts so far describcd the pump includes the customarypacking cup or the like 133 carried by the stem or piston rod 31. whichprojects through the cap 26 and at its outer end is provided with anoperating handle 3?. in the present invention both the packing cup orthe like 33 and handle 35 are connected with the piston rod34 in a noveland cllicient manner.

As shown in the drawings the piston rod custom-34 is provided withprojections 36 and 37 which are located in co-operating pairs spacedfrom earl] other in the direction of the axis ol said stem 34 as shownin Fig. 9. In the preferred form thcsc projections 36 and 37 compriseintegral parts of the tcm formed by lmsctting the metal thereof by meansof a suitable tool. The arrangement includes l'urther u mclallic d rshcdmcmbcr 3e having a central opcning Elf) and recesse Jill locatedpreferably at diamclrically oppd site points of said opening for thcaccommodation of said projections 3?. in assembling the parts thismember 38 placed upon thc stem 3,. in proper position with the rcccsscs14:0 in registry with the projcctions 2i? and moved lengthwise ol saidstcm: as soon as said member 38 passes beyond said projections 37 it maybe given a quartcr turn to bring the recesses lll out o.' registry wilhlllc projections Ill). The lcnglbwlsc movcmcul is then continued untilsaid member finally ill! .lllll menses rests upon" said projections 36as shown in Fig. 9. i The packihgeup or thelilze 33 whirh comprises acup shaped meinber of leather or similar material having-anaxialopening;- is nextplaeed upon the stem 34 in proper position andforced beyond the pr i jeetions 37 into engagement with the l'llel'llbtl38. The device whereby the member 38 and packing cup orthelihe 33 areloclted in position oomprise's au'ietal washer 41-1. having an axialopening 4.2 and diametrically opposite recesses 'slz l'and beii'igprovided with sloping portions 'et'l which extend from the recesses 43along the periphery ot the axial openin}: 4-2. ll1is-washer ll isplaredupon the stemi-rl by passing" the retesses 4 3 over the projections 37and isnioved into engagement with the'bottom ot the"pl.unger 33 so" asto lie within. the same as shown in Fig. 9. To this position the lowerends 01 the sloping pmrtions lei lie slightly below the projections 37so that, when the washer 4]. is given a ('lIHH'tGl turn saidIJIOjGCtlOI'lS ride along said sloping portions and come to rest uponthe surfaceoit said w sher. i'ltf-l this happensa wedging action exertedupon the projections 3'7 whiel securely clamps the packing cup or thelike 33 between the member 38 and the washer L1. andv firmly fixes allthree elements between the projections 36 and S7 in this way thepacking; cup or the like 33 is "fastened securely upon the stem 34without shrew-threading any oi the parts in the ous-.

tou'iary manner and without requiring the use of any screws or otherextrai'ieous fasten inn devices.

Any suitable means may be provided for preventing unintentional rotationof the washer 41 whereby its efiicieuey as looking medium might. beinterfered with. For insta.uce,tl1e washer ell. may be provided withdepressions 41 located preferably at (ha metrically opposite pointsbetween the reeesses a3 and arranged to receive the projertions 37 whenthe washer has been turned to its locking position. If desired thedepressions may be duplicated upon both faces oi the washmll. to receiveboth pairs of projections 37 and 96 although one set oil? (.lQ:}')].QSSl01'lS will generally be 'lfouml suliirient tor the intendedpurpose. in any case the eo-o ieration of the depressions and the pro"jeel ions will 'u'ercnt uuintei'itional rotation of said. washer llili'oi'n its locking position. .lleresses ll may be provided for theaccommodation ot a suitable tool for facilitating the manipulation ofsaid washer.

in the illustrated example the handle which may be eonstruited of woodor other suitable material and ot conventional size and shape providedwith a transverse opening into which a ietal socket member 45 is tiltedand held by i rielion and by means of projections it; wl ieh rxtmul intogrooves t? formed in said landle and also preventrotation of the latterrelatively to said socket member so. The latter is constructed with anend wall 4-8 and is internally screwthreaded for the reception of anexternally srrew-threaded tuljmlar bushing: l provided having an(awning; ot substai'itially the same diameter as and in registry withthe bore of the bushing a9 as illustrated in Fig. 3. The stem 34-. isjn'mided. with lugshl-l located preferably at diametrically oppositepoints andv prel'erabl y formed by iuisetting the metal oiwhich the stemconstructed illoronneet thehandle' with the stem the latter insertedthrough the opening 51 and projected into the bushing a9 witl the lugsin registry with and moving lengtlr wise ot the slots untils the endface of the stem 3d: eontacts with the end wall 48. The stem and handleare'then rotated. relatively to each other in a directionto movethe'lugs into the transverse portions ol? said bay-' onet slots 50. Theparts are so proportioned that as this occurs. the lugs will bearagainst the lower walls of the transverse portions of the bayonet slots50 and will force the end face of the stem 3% against the end wall 48under pressure so that a wedging action is exerted between said lowerwalls (if? the slots 50 and the end wall 4L8 of the soelcet member 4.5.ln this way not only the/handle itselt lirmly locked upon the stem 13%but the bi'ishing 4-9, in addition, is securely fixed in the member 45against relative rotation and unintentional displacement. The handle maybe readily detached by a reverse movement to bring the lugs from thetransverse portions of the slots 50 into the longitudinal portionsthereot; in this position of the parts the stem may be readily withdrawnfrom the bushing and thus separated from the handle.

The pump with the novel Matures herein enumerated and describedrepresents an or- ;anizcatimi of maximum etlirienry and aim .Itity inwhich all parts may he eronoini rally produceifl and assembled. Thedisassemblilui' oi the pumps may also be ilCQOlll.

plished without a u ireriahle ellort whereby the packing of the pump ina tool kit or otherwise is facilitated.

Various ehanges in the specific form shown and described maybe madewithin the scope of the claims without departing from the spirit of myinvention.

l claim:

1. The combination oi an end member. a tubular member extending into thesame eooperatinr shoulders on said members whereby a separation thereotin a axial. dirm-tion is prevented and means comprising an integralportion of said end member whereby an internal pressure is exerted uponsaid shoulders to clamp them together.

2. In an air pump, the combination of a base. a neck projecting fromsaid base and provided with an axial bore, an annular shoulder forming acontinuation of said bore, a pump cylinder fitted within said bore, anannular shoulder forming a continuation ot said cylinder and fittedagainst the annular shoulder of said neck and an annularflange-comprising an integral part of said base and-extending beneathand in engagement with the annular shoulder of said cylinder to clampsame against the shoulder of said neck.

3. In an air pump, the combination of a base, a pump cylinder carriedthereby, a stirrup member comprising two sez-tions hinged together andprovided with a slot in registry with the hinged connection, saidstirrup member extending transversely beneath and beyond said base andalocking member rotatably mounted on said base and arrangedto projectthrough andtransversely across said slot to detachably lock said stirrupmember on said base.

4. In an air pump. the combination of a base, a pump cylinder carriedthereby. a stirrup member provided with a slot and extendingtransversely beneath and beyond said base and a locking member rotatablymounted on said base and arranged to project through and transverselyacross said slot to detachably lock said stirrup member on said base.

5. In an air pump. the combination of a base. depending fianuesextendin; along opposite edges thereoi. a pump cylinder carried by saidbase. a stirrup member located beneath said base and between the flangesthereof. said stirrup member bein; provided with an elongated slot. alo(-kin; member rotatahlymounted on said base and an elongated headarranged to pass through said slot and transversely across the same insur- 'l"a :e ennzmement with said stirrup member to detachably lock sameupon said base.

In testimony whereof I have hereunto set my hand.

CHARLES D. BRANDT.

